I went to use my computer today and tried to write some emails. I went to iuse backspace and it only works backwards. So insteadof deleting back a space it must be placed before a letter in order to delete it. VERY ANNOYING.

Also my arrow keys dont work anymore. Any reason or clue as woto why this happened all of a sudden...out of the blue?

This is a difficult problem. There is some evidence that two apps, "HyperSpaces", and "I Love Stars" can interfere with your arrow keys. Check to see if either of those apps is on your Mac. Some have said that they cured the problem by creating a new user and switching over to it. In both instances, it sounds like something has overridden your normal preferences controlling keyboard functions.